diff --git a/create_ca_cert.sh b/create_ca_cert.sh
index 4ae134b..5e5ce36 100644
--- a/create_ca_cert.sh
+++ b/create_ca_cert.sh
@@ -25,9 +25,9 @@ CN_WEB=${CN_WEB:0:64}
 mkdir -p /certs /ca
 cd /ca
 
-CA_KEY_FILE=/ca/ca.key
-CA_CRT_FILE=/ca/ca.crt
-CA_SRL_FILE=/ca/ca.srl
+CA_KEY_FILE=${CA_KEY_FILE:-/ca/ca.key}
+CA_CRT_FILE=${CA_CRT_FILE:-/ca/ca.crt}
+CA_SRL_FILE=${CA_SRL_FILE:-/ca/ca.srl}
 
 if [ -f "$CA_CRT_FILE" ] ; then
     logInfo "CA already exists. Good. We'll reuse it."
@@ -121,4 +121,4 @@ logInfo "Concatenating fullchain.pem..."
 cat web.crt ia.crt ${CA_CRT_FILE}  > fullchain.pem
 
 logInfo "Concatenating fullchain_with_key.pem"
-cat fullchain.pem web.key > fullchain_with_key.pem
\ No newline at end of file
+cat fullchain.pem web.key > fullchain_with_key.pem